Parse Host : URL « Network « Java Tutorial

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public class Utils {
  /**
   * @param hostStr
   * @return
   */
  static public String parseHost(String hostStr) {
      int sepIdx = hostStr.indexOf(':');
      if (sepIdx < 0) {
          return hostStr;
      } else {
          return hostStr.substring(0, sepIdx);
      }
  }
}